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Design of a Model Based Controller for Regulation of Auto-Ignition

[+] Author Affiliations
William de Ojeda

International Truck and Engine Corporation

Paper No. IMECE2005-80594, pp. 425-431; 7 pages
doi:10.1115/IMECE2005-80594
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-4216-9 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

The present paper considers a model predictive controller to sustain a combustion system that relies in the auto-ignition of a fuel/air mixture. The auto-ignition process relies in elevating the fuel/air mixture to the ignition temperature to initiate the combustion process. The homogeneity or heterogeneous characteristics of the mixture have a strong influence on the process as well as the fuel composition, Diesel or gasoline, and charge mixture temperature. The auto-ignition process is examined in a compression ignition (CI) engine platform, with Diesel fuel premixed early in the compression cycle with the charge air. The variations in the temperature of the charge air in each cylinder encountered due to variations in cooling in the cylinder head or unsymmetrical flow characteristics are compensated using a model predictive controller to manipulate the intake valve closing timing (IVC). IVC regulates the effective compression ratio and the timing with respect to the cylinder’s top dead center position when the charge temperature reaches the auto-ignition temperature. Simultaneously, the controller manipulates the fuel mass delivered to the cylinder to adjust torque to the desired level. The paper shows empirical correlations between the intake valve closing and fueling to auto-ignition timing and torque that serve to solve the predictive model when subject to various noise factors.

Copyright © 2005 by ASME

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